html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}

/* ===== ChatGPT Dark Background ===== */
body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    justify-contents: center;
    background-color: #343541;   /* ChatGPT main background */
    color: #ececf1;              /* ChatGPT text color */
}

/* ===== Audio Player ===== */
audio {
    height: 80px;
    width: 80%;
    max-width: 800px;
    margin: 10px 0;

    background-color: #40414f;   /* surface */
    border-radius: 10px;
}

/* ===== Controls Container ===== */
.controls {
    margin-top: 15px;
}

/* ===== Arrow Buttons ===== */
.arrow-btn {
    font-size: 24px;
    padding: 10px 20px;
    margin: 0 10px;
    cursor: pointer;

    background-color: #9999FF;   /* ChatGPT button surface */
    color: #ececf1;
    border: 1px solid #565869;
    border-radius: 8px;

    transition: background-color 0.2s ease, transform 0.1s ease;
}

.arrow-btn:hover {
    background-color: #565869;
}

.arrow-btn:active {
    transform: scale(0.97);
}

/* ===== Video Info Text ===== */
#trackInfo {
    margin-top: 10px;
    font-size: 16px;
    color: #b4b4c0; /* subtle secondary text */
}